We did. Many times. Each time there's a generational shift in wireless technology some people come out and say it's good enough, we're done here, nothing new to make, why do you bother with all this effort. Then we do. And life improves, our experience with technology improves, and we get used to it. Then the cycle repeats itself.
Grab an iPhone 3G and use it for a few days. That's what going back from 5G to 4G will be 5 years from now. Just as it is going back from 4G to 3G today. You've just gotten used to how good things are.